Isaac read



(No Model.)

I. READ. I BOW FOR USE IN DRILLING AND TURNING.

No. 492,559. Patentedf'eb. 28.1893.

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- Units ISAAC READ, OF EASTBOURNE, ENGLAND.

BOW FOR USE IN DRILLING AND TURNING.

SPECIFICATION forming part of Letters Patent No. 492,559, dated February28, 1893.

Application filed February 29, 1892. Serial No. 423,319. (No model.)Patented in England July 23, 1890, No.11,546; in France October 24,1890, No. 209,093, and in Switzerland November 4, 1890, No. 2,904-

To all whom it may concern:

Be it known that I, IsAAo READ, a subject of the Queen of Great Britain,residing at Eastbourne, in the county of Sussex, England, have inventeda new and useful Improvement in Bows for Use in Drilling and Turning,(for which I have obtained Letters Patent in Great Britain, No.11,546,bearing date July 23,1890; in France, No. 209,093, bearing date October24, 1890, and in Switzerland, No. 2,904, bearing date November 4, 1890,)of which the following is a specification.

Myinvention relates to an improvement in bows such as are used bywatchmakers, jewelers and others in drilling and turning watch and otherwork, and myinvention has for its object to provide a more efficient andready means of fastening the hair gut, or other filament to the ends ofthe bow whereby the tension may be quickly adjusted to suit therequirements of the work and the objections to looping and knotting thehair or gut are avoided.

In the accompanying drawings in all the figures of which the same partis indicated by like letters of reference Figurel is a perspective viewof a complete bow made in accordance with my invention. Fig. 2represents enlarged views of the handle end showing the two extremepositions of the hair or gut gripping device. Fig. 3 represents enlargedviews of the fore end of the bow showing the two extreme positions ofthe filament gripping device adopted at that end, and Fig. 4 is aperspective View of the cylinder formed at the handle end of the bowshowing the manner in which the end of the filament is first secured andthen guided to the gripping device.

The invention consists in the combination of a'solid part A or A and atubular part B or B fitting the one in the other with capability oflongitudinal sliding motion the one with regard to the other and eachhaving a transverse hole 0 and O or lateral slit or notch D and D forthe hair gut or other suitable filament E and a spring F acting on thesolid sliding part A or A and tending to put the holes or slits in thetwo parts out of register so as to cause the-filament previouslythreaded or otherwise inserted therein to be firmly nipped between thetwo parts.

It further comprises means for limiting the motion of the sliding part Aor A and of readily operating it so as to make the holes or slits in thetwoparts coincide for the purpose of inserting the filament therein.

In the preferred form the tubular part or socket B or B is affixed tothe end of the bow and contains the solid sliding part or plunger Aor Aand likewise the spring F which tends to force the plunger outward themotion being limited by a lateral stud G or G projecting through a slotH or slots H in the tubular partB or B and by which the plunger may bereadily drawninward to make the holes or slits coincide. Or the plungermay be forced inward by pressure applied to its outer end which is moreconvenient when a lateral slit or notch is used instead of a diametricalhole. The tubular part B at the handle end of the bow is enlarged andformed with a circumferential groove J in which any surplus filament iswound. The forward flange of the tubular part B is drilled through asshown at K at an angle and the rear flange is slit at D to correspondwith the slit D in the part A.

In order to secure the filament E one end is passed through the hole Kfrom the groove J to outside the flange; and any surplus filament iswound in the groove J; the obliquity of the hole K preventing any slipof the filament. The part A is then forced into the part B until thestud G comes against the opposite ends of the slots H when the slits Dand D will correspond as shown and the filament is passed through theslit D into the slit D when the part A is released and the spring Fforces it out and causes this part of the filament to be firmly held.The part A is then forced into the partB so that the holes 0 and Gcorrespond andthe other end of the filament is threaded through theseholes and the part A released when this end of the filamentwill also befirmly gripped. The groove J thus serves to retain any surplus filamentand when.this surplus is exhausted the end of the filament is secured inthe slits D D only.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-

1. In a bow for drilling and turning, a fastener end consisting of thetubular part slitted or perforated, of the solid part sliding thereinand also slittedor perforated, of a spring and of a stud to limit themotion of the solid part: for securing and readily altering the lengthof the hair gut or other filasubstantially as described and shown in theaccompanying drawings.

3. In a bow for drilling and turning, a part B at one end provided witha groove J for holding the surplus filament, with an oblique hole Kpassing through one flange from the bottomof the groove J to outside thepart B for holding the end of the filament, and with a slit in the otherflange for guiding the filament into the gripping mechanism,substantially as described and shown in the accompanying drawings.

ISAAC READ.

Witnesses:

W. F. GERMAIN, G. W. HARRIS.

